%I A005256 M2556
%S A005256 1,3,6,12,23,45,87,171,336,666,1320,2628,5233,10443,20841,41637,83187,
%T A005256 166287,332403,664635,1328934,2657532,5314398,10628130,21254940,
%U A005256 42508560,85014492,170026356,340047479,680089725,1360169007,2720327571
%N A005256 Number of weighted voting procedures.
%D A005256 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A005256 G. Kreweras, Sur quelques problemes relatifs au vote pondere, [ Some 
               problems of weighted voting ] Math. Sci. Humaines No. 84 (1983), 
               45-63.
%D A005256 T. V. Narayana, Recent progress and unsolved problems in dominance theory, 
               pp. 68-78 of Combinatorial mathematics (Canberra 1977), Lect. Notes 
               Math. Vol. 686, 1978.
%D A005256 T. V. Narayana, Lattice Path Combinatorics with Statistical Applications. 
               Univ. Toronto Press, 1979, pp. 100-101.
%H A005256 Herman Jamke (hermanjamke(AT)fastmail.fm), Feb 23 2008, <a href="b005256.txt">
               Table of n, a(n) for n = 1..60</a>
%H A005256 Kreweras, G., <a href="http://www.numdam.org/numdam-bin/fitem?id=MSH_1983__84__45_0">
               Sur quelques problemes relatifs au vote pondere</a>, Mathematiques 
               et Sciences Humaines, 84 (1983), p. 45-63
%F A005256 a(n+1) = 2a(n)-a([(n-2)/2]) starting with a(1)=1 and a(2)=3 (a(n)=0 if 
               n<1). Also a(n)=A062178(n+2)-2. - Herman Jamke (hermanjamke(AT)fastmail.fm), 
               Feb 23 2008
%o A005256 (PARI) a(n)=if(n<3, (n>0)+2*(n>1), 2*a(n-1)-a((n-3)\2)) - Herman Jamke 
               (hermanjamke(AT)fastmail.fm), Feb 23 2008
%Y A005256 Sequence in context: A079735 A050243 A024505 this_sequence A097979 A003204 
               A038620
%Y A005256 Adjacent sequences: A005253 A005254 A005255 this_sequence A005257 A005258 
               A005259
%K A005256 nonn,easy,nice
%O A005256 1,2
%A A005256 N. J. A. Sloane (njas(AT)research.att.com).
%E A005256 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Feb 23 2008